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<html>
<head>
    <meta name='viewport' content='width=device-width,initial-scale=1'>
    <script>
        function registerSuccess() {
            const body = document.body;
            const element = document.createElement('div');
            element.textContent = 'register sw successful.';
            body.appendChild(element);
        }

        navigator.serviceWorker.register('/sw.js')
            .then(reg => registerSuccess())
            .catch(error => console.log('failed!', error));
    </script>
</head>
<body>
</body>
</html>
